Thanks, it’s a 75gallon and it has taken over half the tank, killed all my vallisneria, which covered the bottom of the tank. Now that I know what it is, I know where it came from, it was one of those floating moss balls I brought from the co-op. The Cory’s have really thrived with it and unfortunately, so have my swords, they have over populated the tank. My son was feeding and doing water changes while I was bed ridden and he kept telling me the snails were out of control and a floating plant. I was shocked when I finally got to see what he was talking about. I appreciate everyone here helping me to figure out what it is and where it grew from.